216 lines
7.3 KiB
C++
216 lines
7.3 KiB
C++
#include "led_effects.h"
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/*****************************************************************
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* Configuration *
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*****************************************************************/
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namespace config {
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const uint8_t max_brightness = MAX_BRIGHTNESS;
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const uint8_t min_brightness = MIN_BRIGHTNESS;
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const int kitt_tail = 3; // How many dimmer LEDs follow in K.I.T.T. wheel
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}
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/*****************************************************************
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* Configuration (calculated from above values) *
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*****************************************************************/
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namespace config //NOTE: Use a class instead? NightMode could then be another state.
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{
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const uint8_t brightness_amplitude = config::max_brightness - config::min_brightness;
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bool night_mode = false;
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}
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#if defined(ESP8266)
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// NeoPixels on GPIO05, aka D1 on ESP8266.
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const int NEOPIXELS_PIN = 5;
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#elif defined(ESP32)
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// NeoPixels on GPIO23 on ESP32. To avoid conflict with LoRa_SCK on TTGO.
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const int NEOPIXELS_PIN = 23;
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#endif
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const int NUMPIXELS = 12;
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//NOTE: One value has been prepended, to make calculations easier and avoid out of bounds index.
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const uint16_t CO2_TICKS[NUMPIXELS + 1] = { 0, 500, 600, 700, 800, 900, 1000, 1200, 1400, 1600, 1800, 2000, 2200 }; // [ppm]
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// const uint16_t CO2_TICKS[NUMPIXELS + 1] = { 0, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1800, 2000, 2200 }; // [ppm]
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// For a given LED, which color should be displayed? First LED will be pure green (hue angle 120°),
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// last 4 LEDs will be pure red (hue angle 0°), LEDs in-between will be yellowish.
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// For reference, this python code can be used to generate the array
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// NUMPIXELS = 12
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// RED_LEDS = 4
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// hues = [ (2**16-1) // 3 * max(NUMPIXELS - RED_LEDS - i, 0) // (NUMPIXELS - RED_LEDS) for i in range(NUMPIXELS) ]
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// '{' + ', '.join([str(hue) + ('U' if hue else '') for hue in hues]) + '}; // [hue angle]'
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const uint16_t LED_HUES[NUMPIXELS] = { 21845U, 19114U, 16383U, 13653U, 10922U, 8191U, 5461U, 2730U, 0, 0, 0, 0 }; // [hue angle]
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// const uint16_t LED_HUES[NUMPIXELS] = { 21845U, 20024U, 18204U, 16383U, 14563U, 12742U, 10922U, 9102U, 7281U, 5461U, 3640U, 1820U, 0, 0, 0, 0 }; // [hue angle]
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Adafruit_NeoPixel pixels(NUMPIXELS, NEOPIXELS_PIN, NEO_GRB + NEO_KHZ800);
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namespace led_effects {
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//On-board LED on D4, aka GPIO02
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const int ONBOARD_LED_PIN = 2;
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void setupOnBoardLED() {
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pinMode(ONBOARD_LED_PIN, OUTPUT);
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}
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void onBoardLEDOff() {
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//NOTE: OFF is LOW on ESP32 and HIGH on ESP8266 :-/
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#ifdef ESP8266
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digitalWrite(ONBOARD_LED_PIN, HIGH);
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#else
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digitalWrite(ONBOARD_LED_PIN, LOW);
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#endif
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}
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void onBoardLEDOn() {
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#ifdef ESP8266
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digitalWrite(ONBOARD_LED_PIN, LOW);
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#else
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digitalWrite(ONBOARD_LED_PIN, HIGH);
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#endif
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}
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void LEDsOff() {
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pixels.clear();
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pixels.show();
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onBoardLEDOff();
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}
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void setupRing() {
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pixels.begin();
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pixels.setBrightness(config::max_brightness);
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LEDsOff();
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}
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void toggleNightMode() {
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config::night_mode = !config::night_mode;
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if (config::night_mode) {
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Serial.println(F("NIGHT MODE!"));
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LEDsOff();
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} else {
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Serial.println(F("DAY MODE!"));
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}
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}
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//NOTE: basically one iteration of KITT wheel
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void showWaitingLED(uint32_t color) {
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delay(80);
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if (config::night_mode) {
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return;
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}
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static uint16_t kitt_offset = 0;
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pixels.clear();
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for (int j = config::kitt_tail; j >= 0; j--) {
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int ledNumber = abs((kitt_offset - j + NUMPIXELS) % (2 * NUMPIXELS) - NUMPIXELS) % NUMPIXELS; // Triangular function
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pixels.setPixelColor(ledNumber, color * pixels.gamma8(255 - j * 76) / 255);
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}
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pixels.show();
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kitt_offset++;
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}
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// Start K.I.T.T. led effect. Red color as default.
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// Simulate a moving LED with tail. First LED starts at 0, and moves along a triangular function. The tail follows, with decreasing brightness.
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// Takes approximately 1s for each direction.
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void showKITTWheel(uint32_t color, uint16_t duration_s) {
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pixels.setBrightness(config::max_brightness);
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for (int i = 0; i < duration_s * NUMPIXELS; ++i) {
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showWaitingLED(color);
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}
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}
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/*
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* For a given CO2 level and ledId, which brightness should be displayed? 0 for off, 255 for on. Something in-between for partial LED.
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* For example, for 1500ppm, every LED between 0 and 7 (500 -> 1400ppm) should be on, LED at 8 (1600ppm) should be half-on.
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*/
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uint8_t getLedBrightness(uint16_t co2, int ledId) {
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if (co2 >= CO2_TICKS[ledId + 1]) {
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return 255;
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} else {
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if (2 * co2 >= CO2_TICKS[ledId] + CO2_TICKS[ledId + 1]) {
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// Show partial LED if co2 more than halfway between ticks.
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return 27; // Brightness isn't linear, so 27 / 255 looks much brighter than 10%
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} else {
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// LED off because co2 below previous tick
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return 0;
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}
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}
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}
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/**
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* Fills the whole ring with green, yellow, orange or black, depending on co2 input and CO2_TICKS.
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*/
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void displayCO2color(uint16_t co2) {
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if (config::night_mode) {
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return;
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}
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pixels.setBrightness(config::max_brightness);
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for (int ledId = 0; ledId < NUMPIXELS; ++ledId) {
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uint8_t brightness = getLedBrightness(co2, ledId);
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pixels.setPixelColor(ledId, pixels.ColorHSV(LED_HUES[ledId], 255, brightness));
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}
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pixels.show();
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}
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void showRainbowWheel(uint16_t duration_ms, uint16_t hue_increment) {
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if (config::night_mode) {
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return;
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}
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static uint16_t wheel_offset = 0;
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unsigned long t0 = millis();
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pixels.setBrightness(config::max_brightness);
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while (millis() - t0 < duration_ms) {
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for (int i = 0; i < NUMPIXELS; i++) {
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pixels.setPixelColor(i, pixels.ColorHSV(i * 65535 / NUMPIXELS + wheel_offset));
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wheel_offset += hue_increment;
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}
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pixels.show();
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delay(10);
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}
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}
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void redAlert() {
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if (config::night_mode) {
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onBoardLEDOn();
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delay(500);
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onBoardLEDOff();
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delay(500);
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return;
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}
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for (int i = 0; i < 10; i++) {
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pixels.setBrightness(static_cast<int>(config::max_brightness * (1 - i * 0.1)));
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delay(50);
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pixels.fill(color::red);
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pixels.show();
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}
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}
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void breathe(int16_t co2) {
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if (!config::night_mode) {
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static uint16_t breathing_offset = 0;
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uint16_t brightness = config::min_brightness
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+ pixels.sine8(breathing_offset) * config::brightness_amplitude / 255;
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pixels.setBrightness(brightness);
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pixels.show();
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breathing_offset += 3; // breathing speed. +3 looks like slow human breathing.
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}
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delay(co2 > 1600 ? 50 : 100); // faster breathing for higher CO2 values
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}
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/**
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* Displays a complete blue circle, and starts removing LEDs one by one. Returns the number of remaining LEDs.
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* Can be used for calibration, e.g. when countdown is 0. Does not work in night mode.
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*/
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int countdownToZero() {
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if (config::night_mode) {
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Serial.println(F("Night mode. Not doing anything."));
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delay(1000); // Wait for a while, to avoid coming back to this function too many times when button is pressed.
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return 1;
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}
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pixels.fill(color::blue);
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pixels.show();
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int countdown;
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for (countdown = NUMPIXELS; countdown >= 0 && !digitalRead(0); countdown--) {
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pixels.setPixelColor(countdown, color::black);
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pixels.show();
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Serial.println(countdown);
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delay(500);
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}
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return countdown;
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}
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}
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